Julien Temple’s long-awaited doc on the life of one of punk rock’s greatest icons is often a contradictory, convoluted mess. Not one talking head here is identified by name or significance. Best — and what especially makes Temple’s film more than a throwaway — is the vintage musical footage. While Clash fans will find Temple’s film essential (if not disappointing), Clash newcomers will be lost, unable to fully understand why Strummer’s death at such a relatively young age was a rock ’n’ roll tragedy.